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Tag: script

flatten a directory structure 🥾

Published by Silveira on 2026-10-20

I often find myself in a situation where I need to flatten a directory structure. I kept reusing variants of this script to flatten a directory using find.

I rewrote that with a little cli written in Rust:

It features:

  • 10~30x faster because eliminates subprocess launching and redundant directory scans.
  • Rust native filesystem API handling already takes care of spaces, Unicode, and symbols out-of-the-box. This was the a major breaking point of the original script and its variants.
  • Safeguards against conflicts and collisions.
  • Suits of tests coverages to avoid regressions.
  • –undo, –dryrun and other special subcommands.

Mac: changing screenshots location

Published by Silveira on 2023-06-22 
mkdir ~/Desktop/screenshots

defaults write com.apple.screencapture location ~/Desktop/screenshots

killall SystemUIServer
  1. Creates a directory in /Users/username/Desktop/screenshots.
  2. Sets the default screenshot location to that directory.
  3. Restarts the service responsible for screenshots.

New screenshots (?+Shift+3, 4 or 5) are now stored in ~/Desktop/screenshots.

Cedilha no Ubuntu 16.04

Published by Silveira on 2017-03-05 
    çççç
  ççç  ççç 
  ççç  ççç 
  ççç 
  ççç 
  ççç  ççç 
    çççç
     çç
    çç

Fiz esse script (cedilha.sh) pra fazer o c-cedilha (ç) funcionar no Ubuntu 16.04. Como é uma tarefa chata que eu já tive que fazer muitas vezes fica mais fácil pra mim ter um script pra fazer isso e pode ser que seja útil a outras pessoas. Infelizmente é uma solução que exige baixar e executar como root um script da internet. Eu recomendo que você leia o script e entenda o que está acontecendo antes de executá-lo. Esse script altera vários arquivos importantes e ele faz um backup (.bak) desses arquivos.

[bash]wget https://raw.githubusercontent.com/silveira/cedilha.sh/master/cedilha.sh
sudo bash cedilha.sh[/bash]

Por favor, se o script funcionou pra você também, diga nos comentários. Se você não está usando Ubuntu 16.04 e quer testar o script ainda assim, edite o script e remova a verificação no inicio do programa.

find a process running a deleted library

Published by Silveira on 2014-06-09

sudo find /proc -maxdepth 2 -name maps -exec grep -HE ‘\(deleted\)’ {} \; | cut -d/ -f3 | sort -u | xargs –no-run-if-empty ps

Looking for libssl in specific:

sudo find /proc -maxdepth 2 -name maps -exec grep -HE ‘/libssl\.so.* \(deleted\)’ {} \; | cut -d/ -f3 | sort -u | xargs –no-run-if-empty ps

Killing all process using a deleted version of libssl:

sudo find /proc -maxdepth 2 -name maps -exec grep -HE ‘/libssl\.so.* \(deleted\)’ {} \;| cut -d/ -f3 | sort -u | xargs –no-run-if-empty sudo kill

Java, showing script engines

Published by Silveira on 2008-09-10

A simple code to show the script engines installed in your system.

As it uses the JSR-223 you need at least java 6.

import javax.script.ScriptEngineManager;
import javax.script.ScriptEngineFactory;
import java.util.List;

public class ListEngines {
    public static void main(String[] args){
	ScriptEngineManager manager = new ScriptEngineManager();
	List  engines = manager.getEngineFactories();
	for(ScriptEngineFactory engine: engines){
		String name = engine.getEngineName();
		String lang = engine.getLanguageName();
		String ver = engine.getLanguageVersion();
		System.out.println(name+" "+lang+" "+ver);
	}
    }
}

$ java -version
java version “1.6.0_0”
OpenJDK Runtime Environment (build 1.6.0_0-b11)
OpenJDK Client VM (build 1.6.0_0-b11, mixed mode, sharing)
$ javac ListEngines.java
$ java ListEngines
Mozilla Rhino ECMAScript 1.6

For now I just have Rhino ECMAScript (JavaScript) engine accessible that comes with Java 6. I’m trying now to call Jython and JRuby code.

Script to Installing JavaFX Compiler

Published by Silveira on 2008-07-16

Right in this moment you can choose between three options to develop JavaFX:

I did this little script to download the last version of JavaFX continuos build and install it for you.

#!/bin/sh
envfile=$HOME/.bash_profile

#download and unpatch the last build of JavaFx
mkdir jfx
cd jfx
wget http://openjfx.java.sun.com/hudson/job/openjfx-compiler/lastBuild/artifact/openjfx-compiler/dist//*zip*/dist.zip
unzip dist.zip
rm dist.zip

#set files at bin folder as executable
chmod +x dist/bin/*

#add those executables to the path
echo "PATH=\$PATH:`pwd`/dist/bin" >> $envfile

Save this script as install_jfx.sh and execute it. Probably you want to execute it at you home directory. If you want to install JavaFX to root change envfile for /root/.bash_profile, if you want to install to all users change for /etc/profile. I tested this script successfully on my Ubuntu 8.04.

After that open a new terminal and try to see if javafx, javafxc and javafxdoc are available. You can test your enviroment with this simple program.

import javafx.ui.*;
import java.lang.*;

Frame {
  visible: true
  content: FlowPanel {
  content: Button {
      var n = 0
      text: bind Integer.toString(n)
      action: function() {
        n++;
      }
    }
  }
}

Save it as Counter.fx, compile with javafxc Counter.fx and so execute it with javafx Counter.fx.

To know more, take a look into the preliminary JavaFX API or in the article Using JavaFX GUI Toolkit.

Terminal with colors in OpenSolaris

Published by Silveira on 2008-05-07

As the earlies versions of OpenSolaris, my terminal is without colors. That’s a little annoying. As the default user uses Bash you can configure your Bash options in the file ~/.bashrc. Insert in the last lines of your .bashrc file:

alias ls=’ls –color=auto’

Save, close and open your terminal (or just type source ~/.bashrc).

JavaFX: Color picker

Published by Silveira on 2008-02-19

An simple color picker that can be also used as a gadget.

import javafx.ui.*;
import javafx.ui.canvas.*;

var colors = [red:Color, orange:Color, yellow:Color, green:Color,
     cyan:Color,blue:Color, magenta:Color, gray:Color];

var chosenColor: Paint;
chosenColor = black:Color;

var x = 120;
var y = 70;

Canvas{
    content: Group{
        transform: bind translate(x,y)
        content: [Star{
            points: sizeof colors
            rin: 30
            rout: 50
            fill: bind chosenColor
            onMouseDragged: operation(e) {
                x += e.localDragTranslation.x;
                y += e.localDragTranslation.y;
            }
        },
        foreach (i in [1..sizeof colors]) Circle {
            var: self
            transform: [rotate(i*360/sizeof colors,0,0), translate(50,0)]
            radius: 10
            fill: colors[i%sizeof colors]
            onMouseClicked: operation (e){
                chosenColor = self.fill;
            }
        }]
    }
}